[OpenTRV-dev] OpenTRV at local ham club

[Kevin Wood]

Absolutely, and it's useful to do so, just in case you find yourself doing
it the hard way for the wrong reasons, or for no good reason. ;-)

Kevin


> Kevin,
>
> I wasn't saying there was a right or wrong way to do it, just opening a
> discussion on it.
>
> Stuart
>
> On 29/07/14 11:21, Kevin Wood wrote:
>> Hi Stuart,
>>
>> You make a valid point. There's probably not much, if anything, there
>> that
>> the Pi couldn't do itself.
>>
>> Having said that, one of the other requirements is that it needs to be
>> fairly robust against power cuts, so the AVR started out as
>> "supervising"
>> the Pi - providing battery backup power, commanding the Pi to shut down
>> cleanly when the power fails and so on, and it then seemed sensible to
>> make that also responsible for the other time-critical interfaces such
>> as
>> driving the RFM and the dallas sensors. In fact, I have it in mind that,
>> if the Pi corrupts its' flash card and dies completely, the AVR will
>> still
>> be able to control the heating.
>>
>> Maybe I'm being too paranoid?
>>
>> Kevin
>>
>>> Kevin,
>>>
>>> Out of interest what's the reasoning behind having the AVR rather than
>>> getting the Pi to do it all directly ?
>>>
>>> Cheers
>>>
>>> Stuart
>>>
>>> On 29/07/14 10:35, Kevin Wood wrote:
>>>> Hi Bo,
>>>>
>>>> I'm actually working on something quite similar at the moment for a
>>>> second
>>>> home that needs frost protection / monitoring remotely, in this case
>>>> with
>>>> oil fired heating.
>>>>
>>>> My plan is a raspberry pi attached to an AVR which controls the
>>>> heating
>>>> system.
>>>>
>>>> I'm thinking that the AVR can harvest temperature data from a couple
>>>> of
>>>> OneWire sensors, run the heating and hot water schedules and control
>>>> relays that activate the heating system as required. It'll also have
>>>> an
>>>> RFM on the board for later integration with OpenTRV and, if I can
>>>> reverse
>>>> engineer it, the wireless oil level sensor on the oil tank.
>>>>
>>>> R-Pi can host a web interface or, more likely in the first iteration,
>>>> provide a mechanism to at least SSH into it and check everything
>>>> remotely.
>>>> Of course it could also do email notifications and SMS would be
>>>> possible
>>>> either via an internet SMS gateway, or just hang a GSM module off it
>>>> with
>>>> a cheap pay as you go SIM installed?
>>>>
>>>> Does this premises have internet connectivity?
>>>>
>>>> Kevin
>>>>
>>>>> I was at local ham club last night at looked at their heating
>>>>>
>>>>> So far i "THINK" its all electrical heating as there is no district
>>>>> heating
>>>>> installed, makes things a bit more easy since heat not used will go
>>>>> back
>>>>> to
>>>>> the cylinder :-D
>>>>>
>>>>>
>>>>> Next bit, there is one big room with 4 rads, which means one box
>>>>> should
>>>>> control them all, the box will be central placed. Its mainly old
>>>>> timers
>>>>> so
>>>>> the less complicated the better, the rest of the rooms are one rad
>>>>> per
>>>>> room.
>>>>>
>>>>>
>>>>> Mostly @kevin but others might chip in, they have some kind of remote
>>>>> control where they can send a text to turn stuff on and they would
>>>>> like
>>>>> to
>>>>> be able to turn on the heat remotely, how could we get to that?
>>>>>
>>>>> the point is that when the house is locked heating should turn off
>>>>> completely or run at 5degree to prevent frost issues. then either by
>>>>> remote
>>>>> command or when house is unlocked it should go to warm mode, there
>>>>> would
>>>>> be
>>>>> no need to sense if its day or night or if people are in the room
>>>>> etc.
>>>>> the
>>>>> alarm will output a signal when its on/off
>>>>>
>>>>> any ideas?
>>>>>
>>>>> /bo
>>>>>
>>>>> --
>>>>>
>>>>>                    |||||
>>>>>                  @(~Ô^Ô~)@
>>>>> -------------oOo---U---oOo-------------
>>>>> |                                     |
>>>>> |  Bo Herrmannsen                     |
>>>>> |                                     |
>>>>> |                                     |
>>>>> | "blessed are the "cracked",         |
>>>>> |  for its they who let in the light" |
>>>>> |                         Ooo         |
>>>>> |_________________ooO____(   )________|
>>>>>                    (   )    ) /
>>>>>                     \ (    (_/
>>>>>                      \_)
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